Nonodontogenic Cysts

• Midpalatal Cyst of Infants: arise from epithelium trapped between embryologic palatal shelves ("fissural"), midline palatal mass; Rx: enucleation and curettage

• Nasolabial Cyst: arise within the labial vestibule, presents as a swelling of the upper lip or nasal floor; Rx: excision

• Nasopalatine Duct Cyst (Incisive Canal Cyst): derived from embryological remnant of the nasopalatine duct, located between the maxillary central incisors (heart-shaped lucency, >10 mm); Rx: enucleation and curettage for symptomatic lesions

• Aneurysmal Bone Cyst: more common in the teenager with a history of trauma to the mandible, painful; Rx: rapid enucleation to avoid hemorrhage

• Idiopathic Bone Cavity: not a true cyst, may be secondary to a traumatic intramedullary hemorrhage with degeneration of the clot resulting in an air-filled bony space; Rx: biopsy to rule out other lesions

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